Adjusting cutter assembly



G. woMBLE Y ADJUSTI'NG CUTTER ASSEMBLY i Filed Nov. 18,- 1940 NN J r [Il 602:99 Womgle/ ATTORNEYS Patented May 19, 1942 UNE STATS ADJUSTING CUTTER ASSEMBLY George Womble, Portsmoutlli, Va.

Application November 18,1940, Serial No. 366,177

3 Claims.

. but, so far as I am aware, no one has as yet developed an adjusting assembly having the specific advantageous arrangement of parts of that embodied in my invention.

The object of this invention is to obtain accuracy and stability in the axial adjustment of cutters.

Another object is to obtain such an adjustment by means which indicate, inaccurate gradations, the distance of such adjustment,L

Another object Vis simplicity and a lack of superuity of parts in a device for rendering such adjustment. These and other objects may be accomplished by my invention which embodies among its features an arbor or spindle shaft, a plurality of cutters at the ends of said surface mill, a key between the surface mill and the shaft, axially extending key means between the end surfaces of the surface mill and the faces of the cutters, each cutter being threaded on a bushing fitted revolvably on the shaft, said cutter having a rearwardly extending hub and said bushing extending outside the hub, an adjusting nut revolvably fitted on the shaft and having a recess which permits it to be fitted over the bushing and a key in the recess and bushing which permits the bushing Vto be rotated by means of the nut, and a sleeve between the nut and an arbor shank or a lock nut to hold the nut in position. There is a scale of gradations on the nut and a corresponding mark on the cutter hub, to gauge the relative rotation therebetween. The cutter adjustment is made by rotating the nut, this turns the bushing and advances or retracts the cutter along the shaft.

Other objects and features may be become evident from the following description when taken in connection with the accompanying drawing in which,

Figure l is a side View, partly in cross section, of an arbor having surface mills and lcutters which are adjustable by my device, and

Figure 2 is a cross section taken on line 2-2 of Figure 1.

` cutters thereon, a surface mill thereon with the Y consists of a shank I8 and a shaft I'I carrying the surface mills I2, I2, center cutter I3 and end cutters I4, I4. It is the axial adjustment of these end cutters that concerns my invention.

The end cutters are identical in construction and are each mounted on a bushing I5, having a threaded connection therewith, andthe cutters have slightly protruding hubs I6. The bushings I5 protrude slightly fromthe hubs. Nuts I1 are fitted on the shaft and have a recess I8 in their forward end and this recess ts over the bushing I5. A key means I9 is provided between the nut and bushing so that rotation of the nut causes rotation of the bushing. The nut has a wrench-engaging formation as shown at 20 for rotation. Sleeves 2I are placed on the shaft II between the nuts and the shank I0 or a lock nut means 22 to provide stability of the entire organization. Y

Shaft I I is splined and keyed as at 23 to the interior of surface mills I2, whose ends are pro# vided with key means 24 engaging the inside surfaces of cutters I4. By this means themills I2 and cutters I 4 are positively driven'from the shaft and cutters I4 are held from all rotation with respect to the shaft. Y

Hub IB and nut I'I are marked with corresponding indicia to indicate the degree of vrelative rotation. Accordingly, it willbe noted that axial adjustment of the cutters I 4 is obtained by rotating nuts I'I, which in turn rotate bushings I 5 and, by reason of the threaded connec-` tion therewith, cause axial movement of the cutters I4.' By reading the scales on the nuts and hubs, an extreme exactness of adjustment may be obtained.

. Although a preferred embodimentV of my invention is described herein, I do not wish' to be limited thereto but only by the scope of the appended claims.

What is claimed is:

1. In a device of the class described, a cutter Y assembly including a shaft, an end cutter mounted on the shaft, a surface mill fitted on the shaft and splined thereto, the end surface of said mill being keyed to the end cutter, said end cut- Referring tothe drawing in detail, the arbor ter threadedly mounted on a bushing revolvably mounted on the shaft and part o f said bushing protruding from said cutter, an adjusting nut revolvably mounted onthe shaft and having a recess tted over the bushing, key means between the nut and the bushing so that when the nut is rotated on the shaft it causes rotation of the bushing with respect to the cutterV and axial movement of the cutter.

' and indicia on the nut and hub to indicate relative rotation so that, by 'this relative rotation,

the cutter may be adjusted as to axial position.

3. In a device of the character described, a shaft, a surface mill splined on the said shaft, an exteriorly threaded bushing rotatably mounted on the shaft at one end of the said mill, an end cutter threadedly mounted on the said bushing and keyed to the said mill, a nut rotatably tted on the shaft and threadedly engaging an extending portion of the bushing, the said nut having t a recess therein, and a key tted in the recess of the nut and engaging the bushing for locking the nut and bushing.

GEORGE WOMBLE. 

